Using Router Scan is straightforward:

provide download links and installation instructions for Windows and Kali Linux. Open Source Directories : Sites like SourceForge

Using Router Scan against any router you do not own or have explicit permission to test is:

Always download Router Scan or similar networking utilities directly from the developer's official website, official GitHub repository, or verified community forums (such as the official Stas'M blog or trusted security portals). Avoid third-party aggregators, YouTube video descriptions, and unverified file-sharing links. Verify File Integrity

Don’t download it. Don’t run it. Don’t believe the YouTube hype. If you want to learn router security, do it legally in your own lab or through certified training platforms.